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<br />ORA F T <br /> <br />miles, with an overall average runoff of only approximately 2.3 <br />inches 12/. <br /> <br />" <br /> <br />Approximately 75 percent of the total Upper Basin water supply comes <br />from these eight runoff areas that represent 13 percent of the Upper <br /> <br />Basin area. Another 10 percent of the runoff is produced in the <br /> <br />additional 9,500 square miles yielding 1 to 10 inches runoff. About <br />half these lower yield areas immediately surround the eight major <br /> <br />runoff areas. <br /> <br />The major producing runoff areas are generally above the 9000- to <br /> <br />9500-foot elevation level and have an average winter precipitation <br /> <br />of about 22 inches during the October through April period (table 1). <br /> <br />These eight areas and adjoining lower water yield areas are the <br /> <br />primary locations for cloud seeding. <br />Table 1. - Runoff areas <br /> <br />i <br /> <br /> Average winter <br />High yield Area size (October-April) <br />runoff areas (square miles) precipitation States <br /> (inches) <br />Upper Green 1,050 23.0 Wyoming <br />Uinta 2,250 20.5 Utah-Wyoming <br />Yampa 1,450 23.5 Colorado-Wyoming <br />White 1,100 23.4 Colorado <br />Upper Colorado 3,000 20.7 Colorado <br />Grand Mesa 450 24.2 Colorado <br />Gunnison 1,600 21.4 Colorado <br />San Juan 3,300 24.1 Colorado-New Mexico <br />Upper Basin 14,200 Total 22.3 Average <br /> <br />13 <br />